Method for measuring illuminance, and electronic device therefor

A method of controlling a foldable electronic device, the method comprising:

• acquiring an illuminance value by using a photosensor;
• acquiring data related to an incident angle of light emitted to the photosensor by comparing an intensity of light shining on a first area of the photosensor with an intensity of light shining on a second area of the photosensor;
• correcting the illuminance value based on the data related to the incident angle of the light;
• determining a brightness of a first portion of a display exposed through a first face of a first housing, based on the corrected illuminance value;
• and
• determining a brightness of a second portion exposed through a third face in the display, based on the corrected illuminance value and an angle formed by the first housing and a second housing,
• wherein the photosensor is disposed within the first housing and comprises a light receiver configured to measure an intensity of light emitting through the first face,
• wherein the first housing includes the first face and a second face opposite to the first face,
• wherein the second housing is foldable with respect to the first housing and comprises the third face and a fourth face opposite to the third face, and
• wherein the display is exposed through the first face and the third face.

An electronic device comprising:

• a housing;
• a display;
• a photosensor disposed inside the housing and comprising a light receiver configured to measure an intensity of light shining on the electronic device;
• and
• at least one processor operatively connected with the photosensor,
• wherein the light receiver comprises a plurality of photodiodes
• wherein the at least one processor is configured to:
• acquire an illuminance value by using the photosensor,
• acquire data related to an incident angle of the light emitted to the electronic device by comparing an intensity of light shining on a first area of the light receiver with an intensity of light shining on a second area of the light receiver,
• correct the illuminance value based on the data related to the incident angle of the light, and
• determine a brightness of the display, based on the corrected illuminance value.